Adjustable bracket



(NoModeL) C. E. KELLS, Jr. Adjustable Bracket.

No 228,645. Patented June 8,1880.

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N PE ERs. FHOTO-LITNOGRAPNER, WASHINGYON. D C.

UNITED STATES FFicE.

PATENT ADJUSTABLE BRACKET.

SPECIFICATION forming part of Letters Patent No. 228,645, dated June 8,1880.

Application filed March 24,1880. (No model.)

To all whom "it may concern Be it known that 1, CHARLES EDMUND KELLS,Jr., of New Orleans, in the parish of Orleans and State of Louisiana,have invented a new and Improved Adjustable Bracket, of which thefollowing is a specification.

The object of this invention is to provide a bracket especially designedfor dentists use, which may be readily adjusted in a horizontal orvertical position.

The invention consists of a tube containing a spring-actuatedlongitudinally-inoving ratchet, said tube being secured upon a platewhich is pivoted. to the end of two parallel arms, whose other ends arepivoted to a plate that is designed to be fixed to the wall of a room.

Figure 1 is a side elevation of the device. Fig. 2 is an enlargedlongitudinal sectional elevation of the tube and ratchet. Fig. 3 is atransverse sectional elevation of the same on line a m, Fig. 2. Fig. 4is a longitudinal seetional elevation of the spring-bolt.- Fig. 5 is aside elevation of the same.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents a plate of nearly triangular outline, uponwhich plate A is secured a tube, B, which contains the ratchet C, saidratchet O being slotted, as shown at a a, and secured within said tube Bby means of pins 1), that pass through the tube B and the said slots aa. The teeth of said ratchet project downward through the slot 0 in theunder side of the said tube B, and on the edge of said ratchet, andprojecting through the slot 0 of the tube B, is a handle, (I, by meansof which handle (I said ratchet O is moved. The said ratchet O isfurther actuated by the spring f, that extends between its end and theend of the tube B, as shown in Fig.2.

D D are the parallel arms, an end of each of which is pivoted in theopposite corners of plate A, while the opposite ends of said arms D arepivoted to a plate, E, that is desi ned to be fastened somewhere in theroom in which the bracket is used.

F is a spring-bolt case fastened upon the plate A immediately below thetube B, so that the projecting handle 9 of the bolt Gr shall engage,when desired, with the teeth of the ratchet O, and so that the end ofthe bolt G shall engage, when desired, in the teeth of the segmentalrack H, which extends across the parallel bars D D, and is pinnedthereto.

I is the table, supported on the end of the tube B.

The slots a a in the ratchet O are so shaped that by pulling upon thehandle d the said ratchet O is drawn downward slightly out of the slot0, so that its teeth shall engage in the handle g of the spring-bolt G.and thereby disengage the said bolt G from the teeth of the rack H, inorder that the plate A and all the parts secured upon it may be adjusted vertically.

On releasing the handle d the spring f operates to retract the ratchet Oand draw it upward at the same time within the tube B, therebydisengaging the teeth of said ratchet from the handle 1 of thespring-bolt G, and permitting said bolt to re-engage in the teeth of therack H, as shown in Fig. 1, and hold the device in the desired position.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent 1. An adjustable bracket, constructedsubstantially as herein shown and described, consistin g of the plate A,slotted tube B, attached thereto, slotted ratchet O, pinned within saidtube, pivoted parallel arms D D, rack H, secured across said arms,spring-bolt G, pro vided with a handle, g, and table 1, operating incombination, as set forth.

2. In an adjustable bracket, the combination, with the table I and plateA, of the slotted tube B, slotted ratchet 0, provided with handle (I,and spring-bolt Gr, provided with handle g, substantially as hereinshown and described.

O. EDMUND KELLS, JR.

Witnesses:

CHARLES E. KELLS, W. H. STUART.

